main/udptl.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * UDPTL support for T.38
   5  *
   6  * Copyright (C) 2005, Steve Underwood, partly based on RTP code which is
   7  * Copyright (C) 1999-2006, Digium, Inc.
   8  *
   9  * Steve Underwood <steveu@coppice.org>
  10  *
  11  * This program is free software, distributed under the terms of
  12  * the GNU General Public License
  13  *
  14  * A license has been granted to Digium (via disclaimer) for the use of
  15  * this code.
  16  */
  17
  18 #include "asterisk.h"
  19
  20 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/time.h>
  26 #include <signal.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <netinet/in.h>
  30 #include <sys/time.h>
  31 #include <sys/socket.h>
  32 #include <arpa/inet.h>
  33 #include <fcntl.h>
  34
  35 #include "asterisk/udptl.h"
  36 #include "asterisk/frame.h"
  37 #include "asterisk/logger.h"
  38 #include "asterisk/options.h"
  39 #include "asterisk/channel.h"
  40 #include "asterisk/acl.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/config.h"
  43 #include "asterisk/lock.h"
  44 #include "asterisk/utils.h"
  45 #include "asterisk/cli.h"
  46 #include "asterisk/unaligned.h"
  47 #include "asterisk/utils.h"
  48
  49 #define UDPTL_MTU               1200
  50
  51 #if !defined(FALSE)
  52 #define FALSE 0
  53 #endif
  54 #if !defined(TRUE)
  55 #define TRUE (!FALSE)
  56 #endif
  57
  58 static int udptlstart;
  59 static int udptlend;
  60 static int udptldebug;                    /* Are we debugging? */
  61 static struct sockaddr_in udptldebugaddr;   /* Debug packets to/from this host */
  62 #ifdef SO_NO_CHECK
  63 static int nochecksums;
  64 #endif
  65 static int udptlfectype;
  66 static int udptlfecentries;
  67 static int udptlfecspan;
  68 static int udptlmaxdatagram;
  69
  70 #define LOCAL_FAX_MAX_DATAGRAM      400
  71 #define MAX_FEC_ENTRIES             5
  72 #define MAX_FEC_SPAN                5
  73
  74 #define UDPTL_BUF_MASK              15
  75
  76 typedef struct {
  77         int buf_len;
  78         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
  79 } udptl_fec_tx_buffer_t;
  80
  81 typedef struct {
  82         int buf_len;
  83         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
  84         int fec_len[MAX_FEC_ENTRIES];
  85         uint8_t fec[MAX_FEC_ENTRIES][LOCAL_FAX_MAX_DATAGRAM];
  86         int fec_span;
  87         int fec_entries;
  88 } udptl_fec_rx_buffer_t;
  89
  90 struct ast_udptl {
  91         int fd;
  92         char resp;
  93         struct ast_frame f[16];
  94         unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
  95         unsigned int lasteventseqn;
  96         int nat;
  97         int flags;
  98         struct sockaddr_in us;
  99         struct sockaddr_in them;
 100         int *ioid;
 101         uint16_t seqno;
 102         struct sched_context *sched;
 103         struct io_context *io;
 104         void *data;
 105         ast_udptl_callback callback;
 106         int udptl_offered_from_local;
 107
 108         /*! This option indicates the error correction scheme used in transmitted UDPTL
 109             packets. */
 110         int error_correction_scheme;
 111
 112         /*! This option indicates the number of error correction entries transmitted in
 113             UDPTL packets. */
 114         int error_correction_entries;
 115
 116         /*! This option indicates the span of the error correction entries in transmitted
 117             UDPTL packets (FEC only). */
 118         int error_correction_span;
 119
 120         /*! This option indicates the maximum size of a UDPTL packet that can be accepted by
 121             the remote device. */
 122         int far_max_datagram_size;
 123
 124         /*! This option indicates the maximum size of a UDPTL packet that we are prepared to
 125             accept. */
 126         int local_max_datagram_size;
 127
 128         int verbose;
 129
 130         struct sockaddr_in far;
 131
 132         int tx_seq_no;
 133         int rx_seq_no;
 134         int rx_expected_seq_no;
 135
 136         udptl_fec_tx_buffer_t tx[UDPTL_BUF_MASK + 1];
 137         udptl_fec_rx_buffer_t rx[UDPTL_BUF_MASK + 1];
 138 };
 139
 140 static struct ast_udptl_protocol *protos;
 141
 142 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len);
 143 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len);
 144
 145 static inline int udptl_debug_test_addr(struct sockaddr_in *addr)
 146 {
 147         if (udptldebug == 0)
 148                 return 0;
 149         if (udptldebugaddr.sin_addr.s_addr) {
 150                 if (((ntohs(udptldebugaddr.sin_port) != 0)
 151                         && (udptldebugaddr.sin_port != addr->sin_port))
 152                         || (udptldebugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
 153                         return 0;
 154         }
 155         return 1;
 156 }
 157
 158 static int decode_length(uint8_t *buf, int limit, int *len, int *pvalue)
 159 {
 160         if ((buf[*len] & 0x80) == 0) {
 161                 if (*len >= limit)
 162                         return -1;
 163                 *pvalue = buf[*len];
 164                 (*len)++;
 165                 return 0;
 166         }
 167         if ((buf[*len] & 0x40) == 0) {
 168                 if (*len >= limit - 1)
 169                         return -1;
 170                 *pvalue = (buf[*len] & 0x3F) << 8;
 171                 (*len)++;
 172                 *pvalue |= buf[*len];
 173                 (*len)++;
 174                 return 0;
 175         }
 176         if (*len >= limit)
 177                 return -1;
 178         *pvalue = (buf[*len] & 0x3F) << 14;
 179         (*len)++;
 180         /* Indicate we have a fragment */
 181         return 1;
 182 }
 183 /*- End of function --------------------------------------------------------*/
 184
 185 static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets)
 186 {
 187         int octet_cnt;
 188         int octet_idx;
 189         int stat;
 190         int i;
 191         const uint8_t **pbuf;
 192
 193         for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) {
 194                 if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0)
 195                         return -1;
 196                 if (octet_cnt > 0) {
 197                         *p_num_octets += octet_cnt;
 198
 199                         pbuf = &p_object[octet_idx];
 200                         i = 0;
 201                         /* Make sure the buffer contains at least the number of bits requested */
 202                         if ((*len + octet_cnt) > limit)
 203                                 return -1;
 204
 205                         *pbuf = &buf[*len];
 206                         *len += octet_cnt;
 207                 }
 208                 if (stat == 0)
 209                         break;
 210         }
 211         return 0;
 212 }
 213 /*- End of function --------------------------------------------------------*/
 214
 215 static int encode_length(uint8_t *buf, int *len, int value)
 216 {
 217         int multiplier;
 218
 219         if (value < 0x80) {
 220                 /* 1 octet */
 221                 buf[*len] = value;
 222                 (*len)++;
 223                 return value;
 224         }
 225         if (value < 0x4000) {
 226                 /* 2 octets */
 227                 /* Set the first bit of the first octet */
 228                 buf[*len] = ((0x8000 | value) >> 8) & 0xFF;
 229                 (*len)++;
 230                 buf[*len] = value & 0xFF;
 231                 (*len)++;
 232                 return value;
 233         }
 234         /* Fragmentation */
 235         multiplier = (value < 0x10000) ? (value >> 14) : 4;
 236         /* Set the first 2 bits of the octet */
 237         buf[*len] = 0xC0 | multiplier;
 238         (*len)++;
 239         return multiplier << 14;
 240 }
 241 /*- End of function --------------------------------------------------------*/
 242
 243 static int encode_open_type(uint8_t *buf, int *len, const uint8_t *data, int num_octets)
 244 {
 245         int enclen;
 246         int octet_idx;
 247         uint8_t zero_byte;
 248
 249         /* If open type is of zero length, add a single zero byte (10.1) */
 250         if (num_octets == 0) {
 251                 zero_byte = 0;
 252                 data = &zero_byte;
 253                 num_octets = 1;
 254         }
 255         /* Encode the open type */
 256         for (octet_idx = 0; ; num_octets -= enclen, octet_idx += enclen) {
 257                 if ((enclen = encode_length(buf, len, num_octets)) < 0)
 258                         return -1;
 259                 if (enclen > 0) {
 260                         memcpy(&buf[*len], &data[octet_idx], enclen);
 261                         *len += enclen;
 262                 }
 263                 if (enclen >= num_octets)
 264                         break;
 265         }
 266
 267         return 0;
 268 }
 269 /*- End of function --------------------------------------------------------*/
 270
 271 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 272 {
 273         int stat;
 274         int stat2;
 275         int i;
 276         int j;
 277         int k;
 278         int l;
 279         int m;
 280         int x;
 281         int limit;
 282         int which;
 283         int ptr;
 284         int count;
 285         int total_count;
 286         int seq_no;
 287         const uint8_t *ifp;
 288         const uint8_t *data;
 289         int ifp_len;
 290         int repaired[16];
 291         const uint8_t *bufs[16];
 292         int lengths[16];
 293         int span;
 294         int entries;
 295         int ifp_no;
 296
 297         ptr = 0;
 298         ifp_no = 0;
 299         memset(&s->f[0], 0, sizeof(s->f[0]));
 300
 301         /* Decode seq_number */
 302         if (ptr + 2 > len)
 303                 return -1;
 304         seq_no = (buf[0] << 8) | buf[1];
 305         ptr += 2;
 306
 307         /* Break out the primary packet */
 308         if ((stat = decode_open_type(buf, len, &ptr, &ifp, &ifp_len)) != 0)
 309                 return -1;
 310         /* Decode error_recovery */
 311         if (ptr + 1 > len)
 312                 return -1;
 313         if ((buf[ptr++] & 0x80) == 0) {
 314                 /* Secondary packet mode for error recovery */
 315                 if (seq_no > s->rx_seq_no) {
 316                         /* We received a later packet than we expected, so we need to check if we can fill in the gap from the
 317                            secondary packets. */
 318                         total_count = 0;
 319                         do {
 320                                 if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
 321                                         return -1;
 322                                 for (i = 0; i < count; i++) {
 323                                         if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
 324                                                 return -1;
 325                                 }
 326                                 total_count += count;
 327                         }
 328                         while (stat2 > 0);
 329                         /* Step through in reverse order, so we go oldest to newest */
 330                         for (i = total_count; i > 0; i--) {
 331                                 if (seq_no - i >= s->rx_seq_no) {
 332                                         /* This one wasn't seen before */
 333                                         /* Decode the secondary IFP packet */
 334                                         //fprintf(stderr, "Secondary %d, len %d\n", seq_no - i, lengths[i - 1]);
 335                                         s->f[ifp_no].frametype = AST_FRAME_MODEM;
 336                                         s->f[ifp_no].subclass = AST_MODEM_T38;
 337
 338                                         s->f[ifp_no].mallocd = 0;
 339                                         //s->f[ifp_no].???seq_no = seq_no - i;
 340                                         s->f[ifp_no].datalen = lengths[i - 1];
 341                                         s->f[ifp_no].data = (uint8_t *) bufs[i - 1];
 342                                         s->f[ifp_no].offset = 0;
 343                                         s->f[ifp_no].src = "UDPTL";
 344                                         if (ifp_no > 0)
 345                                                 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 346                                         AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 347                                         ifp_no++;
 348                                 }
 349                         }
 350                 }
 351                 /* If packets are received out of sequence, we may have already processed this packet from the error
 352                    recovery information in a packet already received. */
 353                 if (seq_no >= s->rx_seq_no) {
 354                         /* Decode the primary IFP packet */
 355                         s->f[ifp_no].frametype = AST_FRAME_MODEM;
 356                         s->f[ifp_no].subclass = AST_MODEM_T38;
 357
 358                         s->f[ifp_no].mallocd = 0;
 359                         //s->f[ifp_no].???seq_no = seq_no;
 360                         s->f[ifp_no].datalen = ifp_len;
 361                         s->f[ifp_no].data = (uint8_t *) ifp;
 362                         s->f[ifp_no].offset = 0;
 363                         s->f[ifp_no].src = "UDPTL";
 364                         if (ifp_no > 0)
 365                                 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 366                         AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 367                 }
 368         }
 369         else
 370         {
 371                 /* FEC mode for error recovery */
 372                 /* Our buffers cannot tolerate overlength IFP packets in FEC mode */
 373                 if (ifp_len > LOCAL_FAX_MAX_DATAGRAM)
 374                         return -1;
 375                 /* Update any missed slots in the buffer */
 376                 for ( ; seq_no > s->rx_seq_no; s->rx_seq_no++) {
 377                         x = s->rx_seq_no & UDPTL_BUF_MASK;
 378                         s->rx[x].buf_len = -1;
 379                         s->rx[x].fec_len[0] = 0;
 380                         s->rx[x].fec_span = 0;
 381                         s->rx[x].fec_entries = 0;
 382                 }
 383
 384                 x = seq_no & UDPTL_BUF_MASK;
 385
 386                 memset(repaired, 0, sizeof(repaired));
 387
 388                 /* Save the new IFP packet */
 389                 memcpy(s->rx[x].buf, ifp, ifp_len);
 390                 s->rx[x].buf_len = ifp_len;
 391                 repaired[x] = TRUE;
 392
 393                 /* Decode the FEC packets */
 394                 /* The span is defined as an unconstrained integer, but will never be more
 395                    than a small value. */
 396                 if (ptr + 2 > len)
 397                         return -1;
 398                 if (buf[ptr++] != 1)
 399                         return -1;
 400                 span = buf[ptr++];
 401                 s->rx[x].fec_span = span;
 402
 403                 /* The number of entries is defined as a length, but will only ever be a small
 404                    value. Treat it as such. */
 405                 if (ptr + 1 > len)
 406                         return -1;
 407                 entries = buf[ptr++];
 408                 s->rx[x].fec_entries = entries;
 409
 410                 /* Decode the elements */
 411                 for (i = 0; i < entries; i++) {
 412                         if ((stat = decode_open_type(buf, len, &ptr, &data, &s->rx[x].fec_len[i])) != 0)
 413                                 return -1;
 414                         if (s->rx[x].fec_len[i] > LOCAL_FAX_MAX_DATAGRAM)
 415                                 return -1;
 416
 417                         /* Save the new FEC data */
 418                         memcpy(s->rx[x].fec[i], data, s->rx[x].fec_len[i]);
 419 #if 0
 420                         fprintf(stderr, "FEC: ");
 421                         for (j = 0; j < s->rx[x].fec_len[i]; j++)
 422                                 fprintf(stderr, "%02X ", data[j]);
 423                         fprintf(stderr, "\n");
 424 #endif
 425                 }
 426
 427                 /* See if we can reconstruct anything which is missing */
 428                 /* TODO: this does not comprehensively hunt back and repair everything that is possible */
 429                 for (l = x; l != ((x - (16 - span*entries)) & UDPTL_BUF_MASK); l = (l - 1) & UDPTL_BUF_MASK) {
 430                         if (s->rx[l].fec_len[0] <= 0)
 431                                 continue;
 432                         for (m = 0; m < s->rx[l].fec_entries; m++) {
 433                                 limit = (l + m) & UDPTL_BUF_MASK;
 434                                 for (which = -1, k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK) {
 435                                         if (s->rx[k].buf_len <= 0)
 436                                                 which = (which == -1) ? k : -2;
 437                                 }
 438                                 if (which >= 0) {
 439                                         /* Repairable */
 440                                         for (j = 0; j < s->rx[l].fec_len[m]; j++) {
 441                                                 s->rx[which].buf[j] = s->rx[l].fec[m][j];
 442                                                 for (k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK)
 443                                                         s->rx[which].buf[j] ^= (s->rx[k].buf_len > j) ? s->rx[k].buf[j] : 0;
 444                                         }
 445                                         s->rx[which].buf_len = s->rx[l].fec_len[m];
 446                                         repaired[which] = TRUE;
 447                                 }
 448                         }
 449                 }
 450                 /* Now play any new packets forwards in time */
 451                 for (l = (x + 1) & UDPTL_BUF_MASK, j = seq_no - UDPTL_BUF_MASK; l != x; l = (l + 1) & UDPTL_BUF_MASK, j++) {
 452                         if (repaired[l]) {
 453                                 //fprintf(stderr, "Fixed packet %d, len %d\n", j, l);
 454                                 s->f[ifp_no].frametype = AST_FRAME_MODEM;
 455                                 s->f[ifp_no].subclass = AST_MODEM_T38;
 456
 457                                 s->f[ifp_no].mallocd = 0;
 458                                 //s->f[ifp_no].???seq_no = j;
 459                                 s->f[ifp_no].datalen = s->rx[l].buf_len;
 460                                 s->f[ifp_no].data = s->rx[l].buf;
 461                                 s->f[ifp_no].offset = 0;
 462                                 s->f[ifp_no].src = "UDPTL";
 463                                 if (ifp_no > 0)
 464                                         AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 465                                 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 466                                 ifp_no++;
 467                         }
 468                 }
 469                 /* Decode the primary IFP packet */
 470                 s->f[ifp_no].frametype = AST_FRAME_MODEM;
 471                 s->f[ifp_no].subclass = AST_MODEM_T38;
 472
 473                 s->f[ifp_no].mallocd = 0;
 474                 //s->f[ifp_no].???seq_no = j;
 475                 s->f[ifp_no].datalen = ifp_len;
 476                 s->f[ifp_no].data = (uint8_t *) ifp;
 477                 s->f[ifp_no].offset = 0;
 478                 s->f[ifp_no].src = "UDPTL";
 479                 if (ifp_no > 0)
 480                         AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 481                 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 482         }
 483
 484         s->rx_seq_no = seq_no + 1;
 485         return 0;
 486 }
 487 /*- End of function --------------------------------------------------------*/
 488
 489 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len)
 490 {
 491         uint8_t fec[LOCAL_FAX_MAX_DATAGRAM];
 492         int i;
 493         int j;
 494         int seq;
 495         int entry;
 496         int entries;
 497         int span;
 498         int m;
 499         int len;
 500         int limit;
 501         int high_tide;
 502
 503         seq = s->tx_seq_no & 0xFFFF;
 504
 505         /* Map the sequence number to an entry in the circular buffer */
 506         entry = seq & UDPTL_BUF_MASK;
 507
 508         /* We save the message in a circular buffer, for generating FEC or
 509            redundancy sets later on. */
 510         s->tx[entry].buf_len = ifp_len;
 511         memcpy(s->tx[entry].buf, ifp, ifp_len);
 512
 513         /* Build the UDPTLPacket */
 514
 515         len = 0;
 516         /* Encode the sequence number */
 517         buf[len++] = (seq >> 8) & 0xFF;
 518         buf[len++] = seq & 0xFF;
 519
 520         /* Encode the primary IFP packet */
 521         if (encode_open_type(buf, &len, ifp, ifp_len) < 0)
 522                 return -1;
 523
 524         /* Encode the appropriate type of error recovery information */
 525         switch (s->error_correction_scheme)
 526         {
 527         case UDPTL_ERROR_CORRECTION_NONE:
 528                 /* Encode the error recovery type */
 529                 buf[len++] = 0x00;
 530                 /* The number of entries will always be zero, so it is pointless allowing
 531                    for the fragmented case here. */
 532                 if (encode_length(buf, &len, 0) < 0)
 533                         return -1;
 534                 break;
 535         case UDPTL_ERROR_CORRECTION_REDUNDANCY:
 536                 /* Encode the error recovery type */
 537                 buf[len++] = 0x00;
 538                 if (s->tx_seq_no > s->error_correction_entries)
 539                         entries = s->error_correction_entries;
 540                 else
 541                         entries = s->tx_seq_no;
 542                 /* The number of entries will always be small, so it is pointless allowing
 543                    for the fragmented case here. */
 544                 if (encode_length(buf, &len, entries) < 0)
 545                         return -1;
 546                 /* Encode the elements */
 547                 for (i = 0; i < entries; i++) {
 548                         j = (entry - i - 1) & UDPTL_BUF_MASK;
 549                         if (encode_open_type(buf, &len, s->tx[j].buf, s->tx[j].buf_len) < 0)
 550                                 return -1;
 551                 }
 552                 break;
 553         case UDPTL_ERROR_CORRECTION_FEC:
 554                 span = s->error_correction_span;
 555                 entries = s->error_correction_entries;
 556                 if (seq < s->error_correction_span*s->error_correction_entries) {
 557                         /* In the initial stages, wind up the FEC smoothly */
 558                         entries = seq/s->error_correction_span;
 559                         if (seq < s->error_correction_span)
 560                                 span = 0;
 561                 }
 562                 /* Encode the error recovery type */
 563                 buf[len++] = 0x80;
 564                 /* Span is defined as an inconstrained integer, which it dumb. It will only
 565                    ever be a small value. Treat it as such. */
 566                 buf[len++] = 1;
 567                 buf[len++] = span;
 568                 /* The number of entries is defined as a length, but will only ever be a small
 569                    value. Treat it as such. */
 570                 buf[len++] = entries;
 571                 for (m = 0; m < entries; m++) {
 572                         /* Make an XOR'ed entry the maximum length */
 573                         limit = (entry + m) & UDPTL_BUF_MASK;
 574                         high_tide = 0;
 575                         for (i = (limit - span*entries) & UDPTL_BUF_MASK; i != limit; i = (i + entries) & UDPTL_BUF_MASK) {
 576                                 if (high_tide < s->tx[i].buf_len) {
 577                                         for (j = 0; j < high_tide; j++)
 578                                                 fec[j] ^= s->tx[i].buf[j];
 579                                         for ( ; j < s->tx[i].buf_len; j++)
 580                                                 fec[j] = s->tx[i].buf[j];
 581                                         high_tide = s->tx[i].buf_len;
 582                                 } else {
 583                                         for (j = 0; j < s->tx[i].buf_len; j++)
 584                                                 fec[j] ^= s->tx[i].buf[j];
 585                                 }
 586                         }
 587                         if (encode_open_type(buf, &len, fec, high_tide) < 0)
 588                                 return -1;
 589                 }
 590                 break;
 591         }
 592
 593         if (s->verbose)
 594                 fprintf(stderr, "\n");
 595
 596         s->tx_seq_no++;
 597         return len;
 598 }
 599
 600 int ast_udptl_fd(struct ast_udptl *udptl)
 601 {
 602         return udptl->fd;
 603 }
 604
 605 void ast_udptl_set_data(struct ast_udptl *udptl, void *data)
 606 {
 607         udptl->data = data;
 608 }
 609
 610 void ast_udptl_set_callback(struct ast_udptl *udptl, ast_udptl_callback callback)
 611 {
 612         udptl->callback = callback;
 613 }
 614
 615 void ast_udptl_setnat(struct ast_udptl *udptl, int nat)
 616 {
 617         udptl->nat = nat;
 618 }
 619
 620 static int udptlread(int *id, int fd, short events, void *cbdata)
 621 {
 622         struct ast_udptl *udptl = cbdata;
 623         struct ast_frame *f;
 624
 625         if ((f = ast_udptl_read(udptl))) {
 626                 if (udptl->callback)
 627                         udptl->callback(udptl, f, udptl->data);
 628         }
 629         return 1;
 630 }
 631
 632 struct ast_frame *ast_udptl_read(struct ast_udptl *udptl)
 633 {
 634         int res;
 635         struct sockaddr_in sin;
 636         socklen_t len;
 637         uint16_t seqno = 0;
 638         uint16_t *udptlheader;
 639
 640         len = sizeof(sin);
 641
 642         /* Cache where the header will go */
 643         res = recvfrom(udptl->fd,
 644                         udptl->rawdata + AST_FRIENDLY_OFFSET,
 645                         sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET,
 646                         0,
 647                         (struct sockaddr *) &sin,
 648                         &len);
 649         udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET);
 650         if (res < 0) {
 651                 if (errno != EAGAIN)
 652                         ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno));
 653                 if (errno == EBADF)
 654                         CRASH;
 655                 return &ast_null_frame;
 656         }
 657
 658         /* Ignore if the other side hasn't been given an address yet. */
 659         if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port)
 660                 return &ast_null_frame;
 661
 662         if (udptl->nat) {
 663                 /* Send to whoever sent to us */
 664                 if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) ||
 665                         (udptl->them.sin_port != sin.sin_port)) {
 666                         memcpy(&udptl->them, &sin, sizeof(udptl->them));
 667                         ast_log(LOG_DEBUG, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
 668                 }
 669         }
 670
 671         if (udptl_debug_test_addr(&sin)) {
 672                 ast_verbose("Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n",
 673                         ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res);
 674         }
 675 #if 0
 676         printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res);
 677 #endif
 678         udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res);
 679
 680         return &udptl->f[0];
 681 }
 682
 683 void ast_udptl_offered_from_local(struct ast_udptl* udptl, int local)
 684 {
 685         if (udptl)
 686                 udptl->udptl_offered_from_local = local;
 687         else
 688                 ast_log(LOG_WARNING, "udptl structure is null\n");
 689 }
 690
 691 int ast_udptl_get_error_correction_scheme(struct ast_udptl* udptl)
 692 {
 693         if (udptl)
 694                 return udptl->error_correction_scheme;
 695         else {
 696                 ast_log(LOG_WARNING, "udptl structure is null\n");
 697                 return -1;
 698         }
 699 }
 700
 701 void ast_udptl_set_error_correction_scheme(struct ast_udptl* udptl, int ec)
 702 {
 703         if (udptl) {
 704                 switch (ec) {
 705                 case UDPTL_ERROR_CORRECTION_FEC:
 706                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
 707                         break;
 708                 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
 709                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
 710                         break;
 711                 case UDPTL_ERROR_CORRECTION_NONE:
 712                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
 713                         break;
 714                 default:
 715                         ast_log(LOG_WARNING, "error correction parameter invalid\n");
 716                 };
 717         } else
 718                 ast_log(LOG_WARNING, "udptl structure is null\n");
 719 }
 720
 721 int ast_udptl_get_local_max_datagram(struct ast_udptl* udptl)
 722 {
 723         if (udptl)
 724                 return udptl->local_max_datagram_size;
 725         else {
 726                 ast_log(LOG_WARNING, "udptl structure is null\n");
 727                 return -1;
 728         }
 729 }
 730
 731 int ast_udptl_get_far_max_datagram(struct ast_udptl* udptl)
 732 {
 733         if (udptl)
 734                 return udptl->far_max_datagram_size;
 735         else {
 736                 ast_log(LOG_WARNING, "udptl structure is null\n");
 737                 return -1;
 738         }
 739 }
 740
 741 void ast_udptl_set_local_max_datagram(struct ast_udptl* udptl, int max_datagram)
 742 {
 743         if (udptl)
 744                 udptl->local_max_datagram_size = max_datagram;
 745         else
 746                 ast_log(LOG_WARNING, "udptl structure is null\n");
 747 }
 748
 749 void ast_udptl_set_far_max_datagram(struct ast_udptl* udptl, int max_datagram)
 750 {
 751         if (udptl)
 752                 udptl->far_max_datagram_size = max_datagram;
 753         else
 754                 ast_log(LOG_WARNING, "udptl structure is null\n");
 755 }
 756
 757 struct ast_udptl *ast_udptl_new_with_bindaddr(struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr addr)
 758 {
 759         struct ast_udptl *udptl;
 760         int x;
 761         int startplace;
 762         int i;
 763         long int flags;
 764
 765         if (!(udptl = ast_calloc(1, sizeof(*udptl))))
 766                 return NULL;
 767
 768         if (udptlfectype == 2)
 769                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
 770         else if (udptlfectype == 1)
 771                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
 772         else
 773                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
 774         udptl->error_correction_span = udptlfecspan;
 775         udptl->error_correction_entries = udptlfecentries;
 776
 777         udptl->far_max_datagram_size = udptlmaxdatagram;
 778         udptl->local_max_datagram_size = udptlmaxdatagram;
 779
 780         memset(&udptl->rx, 0, sizeof(udptl->rx));
 781         memset(&udptl->tx, 0, sizeof(udptl->tx));
 782         for (i = 0; i <= UDPTL_BUF_MASK; i++) {
 783                 udptl->rx[i].buf_len = -1;
 784                 udptl->tx[i].buf_len = -1;
 785         }
 786
 787         udptl->seqno = ast_random() & 0xffff;
 788         udptl->them.sin_family = AF_INET;
 789         udptl->us.sin_family = AF_INET;
 790
 791         if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 792                 free(udptl);
 793                 ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
 794                 return NULL;
 795         }
 796         flags = fcntl(udptl->fd, F_GETFL);
 797         fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK);
 798 #ifdef SO_NO_CHECK
 799         if (nochecksums)
 800                 setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
 801 #endif
 802         /* Find us a place */
 803         x = (ast_random() % (udptlend - udptlstart)) + udptlstart;
 804         startplace = x;
 805         for (;;) {
 806                 udptl->us.sin_port = htons(x);
 807                 udptl->us.sin_addr = addr;
 808                 if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0)
 809                         break;
 810                 if (errno != EADDRINUSE) {
 811                         ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
 812                         close(udptl->fd);
 813                         free(udptl);
 814                         return NULL;
 815                 }
 816                 if (++x > udptlend)
 817                         x = udptlstart;
 818                 if (x == startplace) {
 819                         ast_log(LOG_WARNING, "No UDPTL ports remaining\n");
 820                         close(udptl->fd);
 821                         free(udptl);
 822                         return NULL;
 823                 }
 824         }
 825         if (io && sched && callbackmode) {
 826                 /* Operate this one in a callback mode */
 827                 udptl->sched = sched;
 828                 udptl->io = io;
 829                 udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl);
 830         }
 831         return udptl;
 832 }
 833
 834 struct ast_udptl *ast_udptl_new(struct sched_context *sched, struct io_context *io, int callbackmode)
 835 {
 836         struct in_addr ia;
 837         memset(&ia, 0, sizeof(ia));
 838         return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia);
 839 }
 840
 841 int ast_udptl_settos(struct ast_udptl *udptl, int tos)
 842 {
 843         int res;
 844
 845         if ((res = setsockopt(udptl->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))))
 846                 ast_log(LOG_WARNING, "UDPTL unable to set TOS to %d\n", tos);
 847         return res;
 848 }
 849
 850 void ast_udptl_set_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
 851 {
 852         udptl->them.sin_port = them->sin_port;
 853         udptl->them.sin_addr = them->sin_addr;
 854 }
 855
 856 void ast_udptl_get_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
 857 {
 858         them->sin_family = AF_INET;
 859         them->sin_port = udptl->them.sin_port;
 860         them->sin_addr = udptl->them.sin_addr;
 861 }
 862
 863 void ast_udptl_get_us(struct ast_udptl *udptl, struct sockaddr_in *us)
 864 {
 865         memcpy(us, &udptl->us, sizeof(udptl->us));
 866 }
 867
 868 void ast_udptl_stop(struct ast_udptl *udptl)
 869 {
 870         memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr));
 871         memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port));
 872 }
 873
 874 void ast_udptl_destroy(struct ast_udptl *udptl)
 875 {
 876         if (udptl->ioid)
 877                 ast_io_remove(udptl->io, udptl->ioid);
 878         if (udptl->fd > -1)
 879                 close(udptl->fd);
 880         free(udptl);
 881 }
 882
 883 int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
 884 {
 885         int len;
 886         int res;
 887         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
 888
 889         /* If we have no peer, return immediately */
 890         if (s->them.sin_addr.s_addr == INADDR_ANY)
 891                 return 0;
 892
 893         /* If there is no data length, return immediately */
 894         if (f->datalen == 0)
 895                 return 0;
 896
 897         if (f->frametype != AST_FRAME_MODEM) {
 898                 ast_log(LOG_WARNING, "UDPTL can only send T.38 data\n");
 899                 return -1;
 900         }
 901
 902         /* Cook up the UDPTL packet, with the relevant EC info. */
 903         len = udptl_build_packet(s, buf, f->data, f->datalen);
 904
 905         if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) {
 906                 if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0)
 907                         ast_log(LOG_NOTICE, "UDPTL Transmission error to %s:%d: %s\n", ast_inet_ntoa(s->them.sin_addr), ntohs(s->them.sin_port), strerror(errno));
 908 #if 0
 909                 printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
 910 #endif
 911                 if (udptl_debug_test_addr(&s->them))
 912                         ast_verbose("Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
 913                                         ast_inet_ntoa(s->them.sin_addr),
 914                                         ntohs(s->them.sin_port), 0, s->seqno, len);
 915         }
 916
 917         return 0;
 918 }
 919
 920 void ast_udptl_proto_unregister(struct ast_udptl_protocol *proto)
 921 {
 922         struct ast_udptl_protocol *cur;
 923         struct ast_udptl_protocol *prev;
 924
 925         cur = protos;
 926         prev = NULL;
 927         while (cur) {
 928                 if (cur == proto) {
 929                         if (prev)
 930                                 prev->next = proto->next;
 931                         else
 932                                 protos = proto->next;
 933                         return;
 934                 }
 935                 prev = cur;
 936                 cur = cur->next;
 937         }
 938 }
 939
 940 int ast_udptl_proto_register(struct ast_udptl_protocol *proto)
 941 {
 942         struct ast_udptl_protocol *cur;
 943
 944         cur = protos;
 945         while (cur) {
 946                 if (cur->type == proto->type) {
 947                         ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type);
 948                         return -1;
 949                 }
 950                 cur = cur->next;
 951         }
 952         proto->next = protos;
 953         protos = proto;
 954         return 0;
 955 }
 956
 957 static struct ast_udptl_protocol *get_proto(struct ast_channel *chan)
 958 {
 959         struct ast_udptl_protocol *cur;
 960
 961         cur = protos;
 962         while (cur) {
 963                 if (cur->type == chan->tech->type)
 964                         return cur;
 965                 cur = cur->next;
 966         }
 967         return NULL;
 968 }
 969
 970 int ast_udptl_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
 971 {
 972         struct ast_frame *f;
 973         struct ast_channel *who;
 974         struct ast_channel *cs[3];
 975         struct ast_udptl *p0;
 976         struct ast_udptl *p1;
 977         struct ast_udptl_protocol *pr0;
 978         struct ast_udptl_protocol *pr1;
 979         struct sockaddr_in ac0;
 980         struct sockaddr_in ac1;
 981         struct sockaddr_in t0;
 982         struct sockaddr_in t1;
 983         void *pvt0;
 984         void *pvt1;
 985         int to;
 986
 987         ast_channel_lock(c0);
 988         while (ast_channel_trylock(c1)) {
 989                 ast_channel_unlock(c0);
 990                 usleep(1);
 991                 ast_channel_lock(c0);
 992         }
 993         pr0 = get_proto(c0);
 994         pr1 = get_proto(c1);
 995         if (!pr0) {
 996                 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name);
 997                 ast_channel_unlock(c0);
 998                 ast_channel_unlock(c1);
 999                 return -1;
1000         }
1001         if (!pr1) {
1002                 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name);
1003                 ast_channel_unlock(c0);
1004                 ast_channel_unlock(c1);
1005                 return -1;
1006         }
1007         pvt0 = c0->tech_pvt;
1008         pvt1 = c1->tech_pvt;
1009         p0 = pr0->get_udptl_info(c0);
1010         p1 = pr1->get_udptl_info(c1);
1011         if (!p0 || !p1) {
1012                 /* Somebody doesn't want to play... */
1013                 ast_channel_unlock(c0);
1014                 ast_channel_unlock(c1);
1015                 return -2;
1016         }
1017         if (pr0->set_udptl_peer(c0, p1)) {
1018                 ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name);
1019         } else {
1020                 /* Store UDPTL peer */
1021                 ast_udptl_get_peer(p1, &ac1);
1022         }
1023         if (pr1->set_udptl_peer(c1, p0))
1024                 ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name);
1025         else {
1026                 /* Store UDPTL peer */
1027                 ast_udptl_get_peer(p0, &ac0);
1028         }
1029         ast_channel_unlock(c0);
1030         ast_channel_unlock(c1);
1031         cs[0] = c0;
1032         cs[1] = c1;
1033         cs[2] = NULL;
1034         for (;;) {
1035                 if ((c0->tech_pvt != pvt0) ||
1036                         (c1->tech_pvt != pvt1) ||
1037                         (c0->masq || c0->masqr || c1->masq || c1->masqr)) {
1038                                 ast_log(LOG_DEBUG, "Oooh, something is weird, backing out\n");
1039                                 /* Tell it to try again later */
1040                                 return -3;
1041                 }
1042                 to = -1;
1043                 ast_udptl_get_peer(p1, &t1);
1044                 ast_udptl_get_peer(p0, &t0);
1045                 if (inaddrcmp(&t1, &ac1)) {
1046                         ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
1047                                 c1->name, ast_inet_ntoa(t1.sin_addr), ntohs(t1.sin_port));
1048                         ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
1049                                 c1->name, ast_inet_ntoa(ac1.sin_addr), ntohs(ac1.sin_port));
1050                         memcpy(&ac1, &t1, sizeof(ac1));
1051                 }
1052                 if (inaddrcmp(&t0, &ac0)) {
1053                         ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
1054                                 c0->name, ast_inet_ntoa(t0.sin_addr), ntohs(t0.sin_port));
1055                         ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
1056                                 c0->name, ast_inet_ntoa(ac0.sin_addr), ntohs(ac0.sin_port));
1057                         memcpy(&ac0, &t0, sizeof(ac0));
1058                 }
1059                 who = ast_waitfor_n(cs, 2, &to);
1060                 if (!who) {
1061                         ast_log(LOG_DEBUG, "Ooh, empty read...\n");
1062                         /* check for hangup / whentohangup */
1063                         if (ast_check_hangup(c0) || ast_check_hangup(c1))
1064                                 break;
1065                         continue;
1066                 }
1067                 f = ast_read(who);
1068                 if (!f) {
1069                         *fo = f;
1070                         *rc = who;
1071                         ast_log(LOG_DEBUG, "Oooh, got a %s\n", f ? "digit" : "hangup");
1072                         /* That's all we needed */
1073                         return 0;
1074                 } else {
1075                         if (f->frametype == AST_FRAME_MODEM) {
1076                                 /* Forward T.38 frames if they happen upon us */
1077                                 if (who == c0) {
1078                                         ast_write(c1, f);
1079                                 } else if (who == c1) {
1080                                         ast_write(c0, f);
1081                                 }
1082                         }
1083                         ast_frfree(f);
1084                 }
1085                 /* Swap priority. Not that it's a big deal at this point */
1086                 cs[2] = cs[0];
1087                 cs[0] = cs[1];
1088                 cs[1] = cs[2];
1089         }
1090         return -1;
1091 }
1092
1093 static int udptl_do_debug_ip(int fd, int argc, char *argv[])
1094 {
1095         struct hostent *hp;
1096         struct ast_hostent ahp;
1097         int port;
1098         char *p;
1099         char *arg;
1100
1101         port = 0;
1102         if (argc != 4)
1103                 return RESULT_SHOWUSAGE;
1104         arg = argv[3];
1105         p = strstr(arg, ":");
1106         if (p) {
1107                 *p = '\0';
1108                 p++;
1109                 port = atoi(p);
1110         }
1111         hp = ast_gethostbyname(arg, &ahp);
1112         if (hp == NULL)
1113                 return RESULT_SHOWUSAGE;
1114         udptldebugaddr.sin_family = AF_INET;
1115         memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr));
1116         udptldebugaddr.sin_port = htons(port);
1117         if (port == 0)
1118                 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(udptldebugaddr.sin_addr));
1119         else
1120                 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(udptldebugaddr.sin_addr), port);
1121         udptldebug = 1;
1122         return RESULT_SUCCESS;
1123 }
1124
1125 static int udptl_do_debug(int fd, int argc, char *argv[])
1126 {
1127         if (argc != 2) {
1128                 if (argc != 4)
1129                         return RESULT_SHOWUSAGE;
1130                 return udptl_do_debug_ip(fd, argc, argv);
1131         }
1132         udptldebug = 1;
1133         memset(&udptldebugaddr,0,sizeof(udptldebugaddr));
1134         ast_cli(fd, "UDPTL Debugging Enabled\n");
1135         return RESULT_SUCCESS;
1136 }
1137
1138 static int udptl_nodebug(int fd, int argc, char *argv[])
1139 {
1140         if (argc != 3)
1141                 return RESULT_SHOWUSAGE;
1142         udptldebug = 0;
1143         ast_cli(fd,"UDPTL Debugging Disabled\n");
1144         return RESULT_SUCCESS;
1145 }
1146
1147 static char debug_usage[] =
1148   "Usage: udptl debug [ip host[:port]]\n"
1149   "       Enable dumping of all UDPTL packets to and from host.\n";
1150
1151 static char nodebug_usage[] =
1152   "Usage: udptl debug off\n"
1153   "       Disable all UDPTL debugging\n";
1154
1155 static struct ast_cli_entry cli_udptl_no_debug = {
1156         { "udptl", "no", "debug", NULL },
1157         udptl_nodebug, NULL,
1158         NULL };
1159
1160 static struct ast_cli_entry cli_udptl[] = {
1161         { { "udptl", "debug", NULL },
1162         udptl_do_debug, "Enable UDPTL debugging",
1163         debug_usage },
1164
1165         { { "udptl", "debug", "ip", NULL },
1166         udptl_do_debug, "Enable UDPTL debugging on IP",
1167         debug_usage },
1168
1169         { { "udptl", "debug", "off", NULL },
1170         udptl_nodebug, "Disable UDPTL debugging",
1171         nodebug_usage, NULL, &cli_udptl_no_debug },
1172 };
1173
1174 void ast_udptl_reload(void)
1175 {
1176         struct ast_config *cfg;
1177         const char *s;
1178
1179         udptlstart = 4500;
1180         udptlend = 4999;
1181         udptlfectype = 0;
1182         udptlfecentries = 0;
1183         udptlfecspan = 0;
1184         udptlmaxdatagram = 0;
1185
1186         if ((cfg = ast_config_load("udptl.conf"))) {
1187                 if ((s = ast_variable_retrieve(cfg, "general", "udptlstart"))) {
1188                         udptlstart = atoi(s);
1189                         if (udptlstart < 1024)
1190                                 udptlstart = 1024;
1191                         if (udptlstart > 65535)
1192                                 udptlstart = 65535;
1193                 }
1194                 if ((s = ast_variable_retrieve(cfg, "general", "udptlend"))) {
1195                         udptlend = atoi(s);
1196                         if (udptlend < 1024)
1197                                 udptlend = 1024;
1198                         if (udptlend > 65535)
1199                                 udptlend = 65535;
1200                 }
1201                 if ((s = ast_variable_retrieve(cfg, "general", "udptlchecksums"))) {
1202 #ifdef SO_NO_CHECK
1203                         if (ast_false(s))
1204                                 nochecksums = 1;
1205                         else
1206                                 nochecksums = 0;
1207 #else
1208                         if (ast_false(s))
1209                                 ast_log(LOG_WARNING, "Disabling UDPTL checksums is not supported on this operating system!\n");
1210 #endif
1211                 }
1212                 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxUdpEC"))) {
1213                         if (strcmp(s, "t38UDPFEC") == 0)
1214                                 udptlfectype = 2;
1215                         else if (strcmp(s, "t38UDPRedundancy") == 0)
1216                                 udptlfectype = 1;
1217                 }
1218                 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxMaxDatagram"))) {
1219                         udptlmaxdatagram = atoi(s);
1220                         if (udptlmaxdatagram < 0)
1221                                 udptlmaxdatagram = 0;
1222                         if (udptlmaxdatagram > LOCAL_FAX_MAX_DATAGRAM)
1223                                 udptlmaxdatagram = LOCAL_FAX_MAX_DATAGRAM;
1224                 }
1225                 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECentries"))) {
1226                         udptlfecentries = atoi(s);
1227                         if (udptlfecentries < 0)
1228                                 udptlfecentries = 0;
1229                         if (udptlfecentries > MAX_FEC_ENTRIES)
1230                                 udptlfecentries = MAX_FEC_ENTRIES;
1231                 }
1232                 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECspan"))) {
1233                         udptlfecspan = atoi(s);
1234                         if (udptlfecspan < 0)
1235                                 udptlfecspan = 0;
1236                         if (udptlfecspan > MAX_FEC_SPAN)
1237                                 udptlfecspan = MAX_FEC_SPAN;
1238                 }
1239                 ast_config_destroy(cfg);
1240         }
1241         if (udptlstart >= udptlend) {
1242                 ast_log(LOG_WARNING, "Unreasonable values for UDPTL start/end\n");
1243                 udptlstart = 4500;
1244                 udptlend = 4999;
1245         }
1246         if (option_verbose > 1)
1247                 ast_verbose(VERBOSE_PREFIX_2 "UDPTL allocating from port range %d -> %d\n", udptlstart, udptlend);
1248 }
1249
1250 void ast_udptl_init(void)
1251 {
1252         ast_cli_register_multiple(cli_udptl, sizeof(cli_udptl) / sizeof(struct ast_cli_entry));
1253         ast_udptl_reload();
1254 }